do control return back returning to previous slot/function from where signal generate

[quickNitin]

hello everybody,
I have a place in code shown below where slot emits dataAvailable(). After that control will pass to corresponding slot. Do control returns back after execution of that slot.

void MyThread::run()
{
 
 
 
	int fd0 = open("/home/prince/mydev01",O_RDWR|O_NONBLOCK);
 
    	while( ! _end ) 
	{
        read(fd0,&x,sizeof(int));
	read(fd0,&y,sizeof(int));
        emit dataAvailable();
	_semaphore.acquire();
    	}
    	close(fd0); 
 
	emit stopThreadSignal();
	cout<<"\tdataAvailable called";
 
}

void MyThread::run()
{
			


	int fd0 = open("/home/prince/mydev01",O_RDWR|O_NONBLOCK);
    
    	while( ! _end ) 
	{
        read(fd0,&x,sizeof(int));
	read(fd0,&y,sizeof(int));
        emit dataAvailable();
	_semaphore.acquire();
    	}
    	close(fd0); 
	
	emit stopThreadSignal();
	cout<<"\tdataAvailable called";
	
}

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In this case dataAvailable() leads to

void MyDialog::receiveOnRead()
{
 
	QString sx;
	sx.setNum(mth.x);
	QString sy;
	sy.setNum(mth.y);
	label->setText(sx+QString(" ") +sy);
	cout<<"From dialog thread"<<mth.x<<" "<<mth.y;
}

void MyDialog::receiveOnRead()
{
	
	QString sx;
	sx.setNum(mth.x);
	QString sy;
	sy.setNum(mth.y);
	label->setText(sx+QString(" ") +sy);
	cout<<"From dialog thread"<<mth.x<<" "<<mth.y;
}

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It just replaces the lable text.

Well i am sorry i keep asking such related questin again n again but ihave some doubts still prsisting. I have tried with some test pgms which donot make concept clear.